linux-kernel - Re: special handle of scripts/kconfig/zconf.tab.o

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Date:   Sat, 19 Aug 2017 17:01:21 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Cao jin <caoj.fnst@...fujitsu.com>, Michal Marek <mmarek@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: special handle of scripts/kconfig/zconf.tab.o

> > The difference between with/without _shipped is,
> > zconf.{tab,hash,lex}.c_shipped reside under $(srctree),
> > whereas zconf.{tab,hash,lex}.c under $(objtree).
> 
> The whole idea behind the *_shipped file was to have less dependencies
> on the host system buildign the kernel.
> So we did not rely on users having all of flex, bison, gperf
> installed in the right versions.
Another reason to use the _shipped files was to make
the "make *config" step faster for a clean kernel.

It is much faster to copy a file than to runn the tools.
The build machines has become significant faster since
then so maybe this is less than an issue today.

	Sam